Eric,
I suspect you have cleaned your guns a number of times (OCD?), removed the grips and treated most if not all of them with Renaissance Wax. You don't shoot your Lugers (good choice) so stop fiddling with them. Handle them, admire them, photograph them and even field strip them as often as you please then wipe them down with a clean silicone treated cloth and skip any disassembly or cleaning that requires the use of tools. I have been collecting Lugers for over 60 years and that is what I do.
Best regards,
Ron

We owe it to them and all their prior owners! Tks My Mentor! Ps We have know each other for more than forever and you pegged me exactly! "Obsessive Luger Disorder" Thank you for your kindness, patience a luger love you have shown me over the many years, You are a true Idol! Its an honor to even follow in your shadow!! If you ever need a free will with me in it!!!!! Eric~